| 1 | MODULE phys_constants |
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| 2 | |
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| 3 | implicit none |
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| 4 | |
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| 5 | real, parameter :: pi = 4.*atan(1.) ! PI = 3.14159... |
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| 6 | |
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| 7 | real :: g ! Gravity (m/s2) |
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| 8 | real :: r ! Reduced gas constant,r = 8.314511/(mugaz/1000.0) |
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| 9 | real :: mugaz ! Molar mass of the atmosphere (g/mol) |
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| 10 | real :: rad ! Radius of the planet (m) |
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| 11 | real :: cpp ! Cp of the atmosphere |
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| 12 | real :: rcp ! r/cpp |
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| 13 | |
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| 14 | !======================================================================= |
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| 15 | contains |
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| 16 | !======================================================================= |
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| 17 | |
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| 18 | SUBROUTINE read_constants(fname) |
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| 19 | |
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| 20 | use netcdf |
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| 21 | |
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| 22 | implicit none |
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| 23 | |
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| 24 | ! Arguments |
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| 25 | !---------- |
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| 26 | character(*), intent(in) :: fname |
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| 27 | |
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| 28 | ! Local variables |
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| 29 | !---------------- |
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| 30 | real, dimension(:), allocatable :: controle |
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| 31 | integer :: ncid ! File ID |
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| 32 | integer :: varid_controle ! Variable ID for 'controle' |
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| 33 | integer :: dimid_index ! Dimension ID for 'index' |
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| 34 | integer :: nindex ! Size of dimension 'index' |
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| 35 | integer :: ierr ! Return codes |
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| 36 | |
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| 37 | ! Code |
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| 38 | !----- |
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| 39 | ! Open the NetCDF file |
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| 40 | ierr = nf90_open(trim(fname),NF90_NOWRITE,ncid) |
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| 41 | if (ierr /= nf90_noerr) then |
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| 42 | write(*,*) "Error opening file:", trim(nf90_strerror(ierr)) |
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| 43 | error stop |
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| 44 | endif |
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| 45 | |
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| 46 | ! Get the dimension size of 'index' |
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| 47 | ierr = nf90_inq_dimid(ncid,"index",dimid_index) |
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| 48 | if (ierr /= nf90_noerr) then |
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| 49 | write(*,*) "Error getting dimid 'index':", trim(nf90_strerror(ierr)) |
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| 50 | error stop |
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| 51 | endif |
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| 52 | ierr = nf90_inquire_dimension(ncid,dimid_index,len = nindex) |
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| 53 | if (ierr /= nf90_noerr) then |
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| 54 | write(*,*) "Error getting dimension length:", trim(nf90_strerror(ierr)) |
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| 55 | error stop |
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| 56 | endif |
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| 57 | |
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| 58 | ! Get the variable ID for 'controle' |
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| 59 | allocate(controle(nindex)) |
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| 60 | ierr = nf90_inq_varid(ncid,"controle",varid_controle) |
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| 61 | if (ierr /= nf90_noerr) then |
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| 62 | write(*,*) "Error getting variable ID 'controle':", trim(nf90_strerror(ierr)) |
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| 63 | error stop |
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| 64 | endif |
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| 65 | ierr = nf90_get_var(ncid,varid_controle,controle) |
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| 66 | if (ierr /= nf90_noerr) then |
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| 67 | write(*,*) "Error reading 'controle':", trim(nf90_strerror(ierr)) |
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| 68 | error stop |
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| 69 | endif |
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| 70 | |
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| 71 | ! Close the file |
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| 72 | ierr = nf90_close(ncid) |
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| 73 | if (ierr /= nf90_noerr) then |
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| 74 | write(*,*) "Error closing file:", trim(nf90_strerror(ierr)) |
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| 75 | error stop |
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| 76 | endif |
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| 77 | |
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| 78 | ! Initialize the constants with 'controle' data |
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| 79 | rad = controle(5) |
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| 80 | g = controle(7) |
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| 81 | mugaz = controle(8) |
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| 82 | rcp = controle(9) |
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| 83 | r = 8.314511*1000./mugaz |
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| 84 | cpp = r/rcp |
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| 85 | deallocate(controle) |
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| 86 | |
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| 87 | END SUBROUTINE read_constants |
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| 88 | |
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| 89 | END MODULE phys_constants |
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